Patent GB-321604-A (GB)
Title: Improvements in or relating to coal-cutting or like machines
IPC: E21C29/10
Filed: 1929-01-19
Abstract: 321,604. British Jeffrey-Diamond, Ltd., (Jeffrey Manufacturing Co.). Jan. 19, 1929. Coal-cutting machines.-A coal-cutting or like machine has two winding drums on spaced vertical axes, and each drum is capable of independent operation through the medium of fricton or other clutches under manual control. Cutter-chain driving gear.-The motor shaft 4<1>, Fig. 1, drives a bevel gear 7, Fig. 3, loose on a shaft 6 splined to the drive sprocket 22 for the cutter chain 23; a clutch member 12, splined to the shaft 6, may be moved by a pivoted lever 16 to bring clutch teeth 13 thereon into engagement with clutch teeth 14 on the bevel gear 7, whereby the cutter chain is driven. The lever 16 is adjusted by an eccentric 18 on a shaft 19 provided with an axially-movable handle 20 which engages between flanges 21 to lock the parts. Driving a supporting-truck.-Secured to the bevel gear 7 is a bevel gear 25 engaging a bevel gear 26 on a shaft 27 provided with an interrupted flange 28; a hub 31, provided with a sprocket 35 from which the truck is driven, is movable longitudinally to bring a clutch member 30 thereon into or out of driving engagement with the flange 28, a pin 34 engaging either of two annular grooves 32, 33, to hold the hub 31 in adjusted position. Feed-drums, arrangement of.-At the rear of the machine are winding-drums 36, 37, co-operating with wire &c. ropes 38, 39, to control the machine; each drum may be supported on an eccentric 40, Fig. 1, adjustable by a handle 42 to bring internal gears in the drums into or out of engagement with pinions 46, 47 on driving shafts 43, 44. Pins 45 lock the handles 42 in adjusted position. Feed-drums, driving-gear for.-In one form, Figs. 4, 5 and 6, a worm 49 at the rear of the motor shaft drives a worm gear 48 within which is a disc clutch 53 through which the shaft 43 and drum 36 may be driven; the clutch 53 is controlled through a hand wheel 65, Fig. 4, bevel gearing 64, chain 59, and internally threaded sleeve 56 which acts through pins 54. Fixed to the worm gear 48 is an eccentric 80 which, through rods 82, 89, oscillates pawls 86, 93, engaging a ratchet wheel 88 acting through a disc clutch 69 to drive the shaft 44 and drum 37. The disc clutch 69 is controlled by a hand wheel 79, Fig. 4, through bevel gearing, a chain 75 and an internally threaded sleeve 72 acting through pins 70. A pawl 94 prevents reverse movement of the ratchet wheel 87, and a mask plate 95 varies the period of operation of the pawls 86, 93, the plate 95 being adjusted by an arm 96, Fig. 5, provided with a spring-pressed locking pin 97. In a modification, Figs. 8 and 9, the worm 49 drives worm gears 136, 160 concentric with shafts 44, 43 respectively and adapted to drive the latter through planetary gearing; each set of planetary gearing comprises a spider 132 carrying pairs of differential pinions 130, 134, the pinions 130 engaging an internal gear 129 keyed to the respective shaft 43 or 44 and the pinions 134 engaging with a pinion 155 fixed to the respective worm gear 136- or 160 and with a free internal gear 144. Pairs of brake bands 143, 145 and 161, 162 control the spider 132 and internal gear 144 of the gearing driving the respective feed drums 37, 36. The brake bands 143, 145, are applied alternatively by opposite movements of a nut 151, Fig. 9, the nut having fingers 150, 155 engaging the respective brake bands; a similar nut 171 controls the brake bands 161, 162, similarly through fingers, and the nuts are operated by concentric screw-threaded members' 173, 183 controlled through gearing by coaxial hand wheels 181, 190. In a further form, Figs. 14 and 15, a worm 222 drives through wormwheels 220, 221, shafts 216, 217, which, through planetary gearing smilar to the above, drive drums 36<1>, 371 coaxial with the shafts 216, 217; in this case, springs 248, Fig. 15, tend to disengage the brake bands and screw shafts 245, 246, 247, 268 act through nuts 251, 253, 267, 272, to apply the brake bands, pairs of shafts 245, 246 and 247, 268 being connected by gearing 254, 255 and 263, 273 to ensure opposite actuation of the brake bands of each pair.